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73 = 5x + 27
73 - 27 = 5x
46 = 5x
x = 46/5
Sudut AED berpelurus dengan sudut DEC berarti jumlah besar sudut AED dan besar sudut DEC = 180°
73 + (5y + 17) = 180
90 + 5y = 180
5y = 90
y = 90/5
x - y = 46/5 - 90/5 = -44/5
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